Propeller for motor-boats, &amp;c.



T. FRANCISCO; PROPELLER FOR MOTOR BOATS, m.

APPLICATION FILED SEPT, 3,1915.

1,217,742. Patentd Feb. 27, 1917.

Haze 00 T. FRANCISCO.

PROPELLER FOR MOTOR BOATS, &0.

APPLICATION FILED SEPT-3. 19x5.

Patent ed Feb-27,1917.

v c 2 SHEETS-SHEET 2.

TONY FRANCISCO, or RosLYN, WASHINGTON. I

PROPELLER FOR MOTOR-BOATS, 860.

Application filed September 3, 1915.

To all whom it may concern:

Be it known that I, TONY FRANCISCO, a citizen of the United States, residing at Roslyn, in the county of Kittitas and State of Washington, have invented 'certain new and useful Improvements in Propellers for Motor-Boats, &c.; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The invention relates to improvements in propellers for motor-boats and the like.

The object of the present invention is to improve the construction of propellers and to provide a simple, practical and comparatively inexpensive propeller of strong and durable construction adapted to enable motor-boats and the like to develop a maximum speed at the expenditure of a minimum amount of fuel.

With these and other objects in view the invention consists in the construction and novel combination and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings and pointed out in the claims hereto appended, it being understood that various changes in the form, proportion and minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

In the drawings Figure 1 is a rearelevation of a propeller constructed in accordance with this invention Fig. 2 is a side elevation of the same,

Fig. 3 is a detail perspective view of one" of the arms, a pair of blades and the supporting spoke,

Fig. 4 is a detail sectional view of the propeller.

Like numerals of reference designate cor responding parts in the several figures of the drawings. a

In the accompanying drawingsin which Specification of Letters Patent.

Patented 13160.27, 1917.

Serial No. 48,830.

erably formed integral with the hub are designed to be three in number but the number of the spokes may of course be varied and the propeller may be constructed of any dimension. I

Each of the blade supporting arms 3 is centrally connected to and rigid with the outer end of the spokes 2 and its terminals 7 are extended in'opposite directions and are suitably secured to the rear faces of the blades 4. The blades 4 which are constructed of suitable material are substantially oblong and they are connected intermediate of their ends to the angularly disposed terminals 7 of the arms 3 which preferably consists of a single rod and also the oblong blades preferably cut away at the corners at 8 as shown. The blades are supported by the angularly disposed terminals of the arms at an angle to the direction of the rotation of the blades and one blade is set slightly in advance of the other blade of each pair. When the propeller is rotated the angularly disposed blades press against the water and force the boat 9 either forward or backward according to the direction of the rotation of the propeller.

The rods which form the arms 3 are of sufficient length to'locate the front and rear blades in transverse planes in advance and in rear of the hub. This will enable each set of blades to act effectively on the water without one set interfering with the maximum effect of the other.

It will be clear that as the propeller is composed of straight flat oblong blades and supporting means consisting of the central spokes and the arms that it is adapted to be easily and cheaply manufactured and 1 1 may be readily repaired in event of breakage.

What is claimed is 1. A propeller of the class described including radially arrangedsupporting means provided with outer arms extending longitudinally of the axis of the propeller in projecting relation and front and rear separate sets of blades extending in opposite directions from the said arms at an. obtuse angle to the same.

2. A propeller of the class described including a hub, radial spokes, arms arranged in parallelism with the axis of the propeller and having angularly disposed terminals and connected at points intermediate of its ends to the spokes and substantially oblong In testimony whereof I affix my signature blades mounted on the angularly disposed in presence of tWo Witnesses.

terminals of the arms and arran ed in front and rear sets, the front set being located in TONY FRANCISCO advance of the blades of the rear set and the -Witnesses:

1 .blades of each set being disposed at an ob- CHAS. PAs UAN,

tuse angle to the said arms. FRANK ZAPUTIL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

